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  <title>What has changed in PHP 5.2.x</title>

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 <div class="prev" style="text-align: left; float: left;"><a href="migration52.html">Migrating from PHP 5.1.x to PHP 5.2.x</a></div>
 <div class="next" style="text-align: right; float: right;"><a href="migration52.incompatible.html">Backward Incompatible Changes</a></div>
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  <h2 class="title">What has changed in PHP 5.2.x</h2>
  <p class="para">
   Most improvements in PHP 5.2.x have no impact on existing code.  There are
   a <a href="migration52.incompatible.html" class="link">few incompatibilities</a>
   and <a href="migration52.error-messages.html" class="link">new error messages</a>
   that should be considered, and code should be tested before switching PHP
   versions in production environments.
  </p>
  <p class="para">
   If the system is being upgraded from PHP 5.0.x, the manual section titled
   <a href="migration51.html" class="link">Upgrade Notes for PHP 5.1.x</a>
   should also be read.
  </p>
  <p class="para">
   Similarly, if the system is being upgraded from PHP 4, the manual section
   titled <a href="migration5.html" class="link">Migrating from PHP 4 to PHP 5</a>
   should be read as well.
  </p>
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 <div class="prev" style="text-align: left; float: left;"><a href="migration52.html">Migrating from PHP 5.1.x to PHP 5.2.x</a></div>
 <div class="next" style="text-align: right; float: right;"><a href="migration52.incompatible.html">Backward Incompatible Changes</a></div>
 <div class="up"><a href="migration52.html">Migrating from PHP 5.1.x to PHP 5.2.x</a></div>
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